问题

the time humankind started gardening, we _____to make our environment more beautiful.

A:try
B:have been trying
C:are trying
D:will try;

正确答案是：

同类题型

I’m feeling much better now, so you call the doctor.

The message you intend to convey through words maybe the exact opposite of ___________ others actually understand

People are _____ litter ______the river.

I’m a very slow reader.—Just read quickly to get the main idea.Don’t read____.

reme weather, a worn tyre can break easily______ it’s mended, as is often the case.